Manhole-fitting



J. GRAY.

MANHOLE FITTING.

APPLICATION FILED JUNE n. 1919.

1,382,187.. Patented June 21 1.

2 SHEETS-SHEE 1. GRAY.

MANHOLE FITTING.

APPLICATION man JUNE 11 1919.

1 ,382, 1 8'7 v Patented June 21, 19-21.

2 SHEETS-SHEET 2.

JOHN GRAY, 0F NElVCASTLE-UPON-TYNE, ENGLAND, ASSIGNOR TO B. & W. HAW- THORN, LESLIE 6; COMPANY, LIMITED, 0ft NEWCAETLE-UPON-TYNE, ENGLAND.

MANHOLE-FITTING.

Application filed June 11, 1919.

To all whom it may concern:

. Be it known that 1, JOHN GRAY, a subject of the King of the United Kingdom of Great Brigain and Ireland, and residing at Newcastle-upon lFyne, England, have invented a certain new and useful Improvement in l danhole-llittings, of which the following is a specification.

This invention relates to improvements in manhole fittings applicable particularly to steam generators but also suited for vessels, tanks and like structures necessitating the use of a compensating plate to be engaged on one side of the generator or the like by the door which is passed through the manhole from the other side and is maintained in closing position by means controllable from the second mentioned side.

The invention has for an object to provide a construction which permits reduction of the size of the hole to be cut in the shell; a further object is to avoid the necessity for hanging the compensating plate; other objects will appear from the following description.

According to the invention there is formed in the interior face of the compensating plate a groove bounding the hole and the margin of the door is overturned to form an outwardly directed flange to engage the groove and form a joint therewith.

In the accompanying drawings Figure 1 is an inside view of the door frame; Figs. 2 and 3 are sections at right angles to each other showing" the door fitted to the frame.

Referring to the drawings, it will be seen that the compensating plate 1, which may be of substantially the same tensile strength Specification of Letters Patent. Tatented June 21, 1921.

Serial No. 303,358.

as the boiler shell 2, in lieu of being flanged, is formed on its interior face adjacent to its inner edge with a groove 3 bounding the hole; the margin of the door at being overturned to form an outwardly directed flange 5 adapted to engage the groove 3 and form a oint therewith.

A door constructed as described may be of small dimensions and lighter than in prior constructions, and be more easily put in place besides being readily removable without disturbance of the oint; Evidently, the compensating plate may be of smaller dimensions than in prior constructions. in addition, the combined sectional area of the rivets 6 may be less than heretofore and the rivets may be conveniently achine riveted.

l'l hat I claim is in a manhole fitting the combination with a shell having a manhole, of a compensating plate riveted to the interior of said shell, said plate formed with a hole opposite said manhole of smaller area than said manhole, said plate having; in its interior face a groove boundingsaid hole, and a door having an overturned marginal flange ene'aging said egroove and forming a joint therewith. the area defined by the inner edge of said flange being no greater than the area of said manhole.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

' JOHN GRAY. lVitnesses KATE YorrHnnrNoHAM, Isnnnn Rome. 

